Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – For fault location
Reexamination Certificate
2005-06-14
2005-06-14
Le, N. (Department: 2858)
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
For fault location
C324S539000, C375S224000
Reexamination Certificate
active
06906526
ABSTRACT:
A method and an apparatus are employed for individually monitoring the connectivity status of cables connected at a cable modem termination system (CMTS), where the cables conduct upstream and downstream RF communication signals. The monitoring is self-contained within the CMTS. The monitoring is achieved by producing a reference signal having a frequency outside the frequency range of the RF communication signals. The reference signal is injected onto the RF communication signal. The power level of the reference signal is detected within the CMTS, whereby the power level correlates with an expected cable load impedance. A DC control voltage based on the detected power level of the reference signal is generated, which allows a controller to determine the connectivity statuses of the connected cables.
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Cahners Publishing, “CMTS Testing Keeps the Data Flowing” Test and Measurement World; vol. 20, No. 11, Sep. 1, 2000, pp. 47-48, 50, 52, 5, XP001005767; ISSN: 0744-1657; p. 47, middle column, para. 2; p. 47, right-hand column, para. 2; p. 48, middle column, para 1; p. 50, left-hand column, para 1; figure 1.
Hart, Jr. William C.
Moran III John L.
Smentek David J.
General Instrument Corporation
Le N.
Natalini Jeff
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